diff --git a/internal/context/datapath.go b/internal/context/datapath.go
index 00b232d8..f71af290 100644
--- a/internal/context/datapath.go
+++ b/internal/context/datapath.go
@@ -33,14 +33,15 @@ var standardGbr5QIs = map[int32]struct{}{
 	76: {},
 }
 
+type ANInformation struct {
+	IPAddress net.IP
+	TEID      uint32
+}
+
 type UPTunnel struct {
 	PathIDGenerator *idgenerator.IDGenerator
 	DataPathPool    DataPathPool
-	//InvolvedUPFs    map[uuid.UUID]*UPF
-	ANInformation struct {
-		IPAddress net.IP
-		TEID      uint32
-	}
+	ANInformation   *ANInformation
 }
 
 func (t *UPTunnel) String() string {
@@ -624,7 +625,7 @@ func (dataPath *DataPath) ActivateTunnelAndPDR(smContext *SMContext, precedence
 			logger.PduSessLog.Traceln("Current DP Node IP: ", curDataPathNode.UPF.NodeID.ResolveNodeIdToIp().String())
 			logger.PduSessLog.Traceln("Before DLPDR OuterHeaderCreation")
 			if nextDLDest := curDataPathNode.Prev(); nextDLDest != nil {
-				logger.PduSessLog.Traceln("In DLPDR OuterHeaderCreation")
+				logger.PduSessLog.Traceln("In DLPDR OuterHeaderCreation, this is not the AN-UPF node")
 				nextDLTunnel := nextDLDest.DownLinkTunnel
 				// If the flow is disable, the tunnel and the session rules will not be created
 
@@ -652,13 +653,15 @@ func (dataPath *DataPath) ActivateTunnelAndPDR(smContext *SMContext, precedence
 					}
 				}
 			} else {
+				logger.PduSessLog.Traceln("In DLPDR OuterHeaderCreation, this is the AN-UPF node")
 				ANUPF := dataPath.FirstDPNode
 				DLPDR := ANUPF.DownLinkTunnel.PDR
 				DLFAR := DLPDR.FAR
 				DLFAR.ForwardingParameters = new(ForwardingParameters)
 				DLFAR.ForwardingParameters.DestinationInterface.InterfaceValue = pfcpType.DestinationInterfaceAccess
 
-				if anIP := smContext.Tunnel.ANInformation.IPAddress; anIP != nil {
+				if anInfo := smContext.Tunnel.ANInformation; anInfo != nil {
+					logger.PduSessLog.Tracef("anIP not nil, set DL FAR OuterHeaderCreation to IP %s and TEID %d", anInfo.IPAddress, anInfo.TEID)
 					DLFAR.ForwardingParameters.NetworkInstance = &pfcpType.NetworkInstance{
 						NetworkInstance: smContext.Dnn,
 						FQDNEncoding:    factory.SmfConfig.Configuration.NwInstFqdnEncoding,
@@ -667,8 +670,8 @@ func (dataPath *DataPath) ActivateTunnelAndPDR(smContext *SMContext, precedence
 
 					dlOuterHeaderCreation := DLFAR.ForwardingParameters.OuterHeaderCreation
 					dlOuterHeaderCreation.OuterHeaderCreationDescription = pfcpType.OuterHeaderCreationGtpUUdpIpv4
-					dlOuterHeaderCreation.Teid = smContext.Tunnel.ANInformation.TEID
-					dlOuterHeaderCreation.Ipv4Address = smContext.Tunnel.ANInformation.IPAddress.To4()
+					dlOuterHeaderCreation.Teid = anInfo.TEID
+					dlOuterHeaderCreation.Ipv4Address = anInfo.IPAddress.To4()
 				}
 			}
 		}
diff --git a/internal/context/pfcp_rules.go b/internal/context/pfcp_rules.go
index 08589e12..4d5d6310 100644
--- a/internal/context/pfcp_rules.go
+++ b/internal/context/pfcp_rules.go
@@ -296,6 +296,27 @@ func (urr *URR) String(prefix string) string {
 	return str
 }
 
+func SDFFilterToString(filter *pfcpType.SDFFilter, prefix string) string {
+	str := prefix + " SDFFilter {\n"
+	prefix += "  "
+	if filter == nil {
+		return str + prefix + "}"
+	}
+	str += prefix + fmt.Sprintf("SdfFilterId: %d\n", filter.SdfFilterId)
+	str += prefix + fmt.Sprintf("Bid: %t\n", filter.Bid)
+	str += prefix + fmt.Sprintf("Fl: %t\n", filter.Fl)
+	str += prefix + fmt.Sprintf("Spi: %t\n", filter.Spi)
+	str += prefix + fmt.Sprintf("Ttc: %t\n", filter.Ttc)
+	str += prefix + fmt.Sprintf("Fd: %t\n", filter.Fd)
+	str += prefix + fmt.Sprintf("LengthOfFlowDescription: %d\n", filter.LengthOfFlowDescription)
+	str += prefix + fmt.Sprintf("FlowDescription: %s\n", string(filter.FlowDescription))
+	str += prefix + fmt.Sprintf("TosTrafficClass: %v\n", filter.TosTrafficClass)
+	str += prefix + fmt.Sprintf("SecurityParameterIndex: %v\n", filter.SecurityParameterIndex)
+	str += prefix + fmt.Sprintf("FlowLabel: %v\n", filter.FlowLabel)
+	str += prefix + "}"
+	return str
+}
+
 func (pdi *PDI) String(prefix string) string {
 	if pdi == nil {
 		return prefix + "PDI: nil"
@@ -308,7 +329,7 @@ func (pdi *PDI) String(prefix string) string {
 	}
 	str += prefix + fmt.Sprintf("NetworkInstance: %+v\n", pdi.NetworkInstance)
 	str += prefix + fmt.Sprintf("UEIPAddress: %+v\n", pdi.UEIPAddress)
-	str += prefix + fmt.Sprintf("SDFFilter: %+v\n", pdi.SDFFilter)
+	str += prefix + fmt.Sprintf("SDFFilter: %s\n", SDFFilterToString(pdi.SDFFilter, prefix))
 	str += prefix + fmt.Sprintf("ApplicationID: %s\n", pdi.ApplicationID)
 	prefix = prefix[:len(prefix)-2]
 	str += prefix + "}"
@@ -339,7 +360,11 @@ func (far *FAR) String(prefix string) string {
 	prefix += "  "
 	str += prefix + fmt.Sprintf("State: %s\n", far.state)
 	str += prefix + fmt.Sprintf("ApplyAction: %+v\n", far.ApplyAction)
-	str += prefix + fmt.Sprintf("%s\n", far.ForwardingParameters.String(prefix))
+	if far.ForwardingParameters != nil {
+		str += prefix + fmt.Sprintf("%s\n", far.ForwardingParameters.String(prefix))
+	} else {
+		str += prefix + fmt.Sprintln("ForwardingParameters: nil")
+	}
 	if far.BAR != nil {
 		str += prefix + fmt.Sprintf("%s\n", far.BAR.String(prefix))
 	}
diff --git a/internal/sbi/producer/pdu_session.go b/internal/sbi/producer/pdu_session.go
index 4e2d7007..a608d15f 100644
--- a/internal/sbi/producer/pdu_session.go
+++ b/internal/sbi/producer/pdu_session.go
@@ -4,7 +4,6 @@ import (
 	"encoding/hex"
 	"errors"
 	"fmt"
-	"net"
 	"net/http"
 
 	"github.com/antihax/optional"
@@ -645,10 +644,7 @@ func HandlePDUSessionSMContextUpdate(smContextRef string, body models.UpdateSmCo
 		logger.PduSessLog.Traceln("In case N2SmInfoType_PDU_RES_REL_RSP")
 		// remove an tunnel info
 		smContext.Log.Infoln("Handle N2 PDU Resource Release Response")
-		smContext.Tunnel.ANInformation = struct {
-			IPAddress net.IP
-			TEID      uint32
-		}{nil, 0}
+		smContext.Tunnel.ANInformation = &smf_context.ANInformation{}
 
 		if smContext.PDUSessionRelease_DUE_TO_DUP_PDU_ID {
 			smContext.CheckState(smf_context.InActivePending)